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                [Cerc2010]Costing Spells                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt"><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">对于字符串</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt"><v:shapetype id="_x0000_t75" coordsize="21600,21600" o:spt="75" o:preferrelative="t" path="m@4@5l@4@11@9@11@9@5xe" filled="f" stroked="f"><font size="3"><font face="Times New Roman"> W<v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:extrusionok="f" gradientshapeok="t" o:connecttype="rect"></v:path><o:lock v:ext="edit" aspectratio="t"></o:lock></font></font></v:shapetype></span></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">，定义</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">W</span><sup><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">R</span></sup></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">为</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">W</span></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">反序后的字符串。先给定字符串S</font></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">，求</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">S</span></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">的最大子串能表示成</font></span><span lang="EN-US"><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">WW<sup>R</sup>WW</span><sup><span style="position: relative; top: 3pt; mso-text-raise: -3.0pt">R</span></sup></span><span style="font-family: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><font size="3">的形式。</font></span></p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt"><span lang="EN-US">S长度小于等于300000</span></p></p><hr/><h3>输入格式</h3><p></p><hr/><h3>输出格式</h3><p></p><hr/><h3>样例输入</h3><pre>2
abrahellehhelleh
rachelhellabracadabra</pre><hr/><h3>样例输出</h3><pre>12
0
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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